Title: Evaluation of DL MIMO Schemes: OL SU Spatial Multiplexing with 2-D MMSE channel estimation Document Number: IEEE C802.16m-08/1043r2 Date Submitted:

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Title: Evaluation of DL MIMO Schemes: OL SU Spatial Multiplexing with 2-D MMSE channel estimation Document Number: IEEE C802.16m-08/1043r2 Date Submitted: 2008 – Source: Kaushik Josiam, Zhouyue Pi, Bruno Clerckx, David MazzareseVoice: Samsung Telecommunications America 1301 E. Lookout Dr Richardson TX Venue: Session #57, September 2008 Re: PHY: MIMO ; in response to the TGm Call for Contributions and Comments m-08/033 for Session 57 Purpose: Supporting contribution for comment on SDD Text Notice This document does not represent the agreed views of the IEEE Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. 7.html#6http://standards.ieee.org/guides/opman/sect6.html#6.3 Further information is located at and. 1

Simulation Parameters ParameterValue ModulationQPSK, 16-QAM, 64-QAM Coding Rate1/3, 1/2, 2/3, ¾ Receiver Function2-D MMSE Channel Estimator, MMSE receiver Sub-frame Duration0.617ms Transmission BW10MHz Usable Subcarriers54 CP Length µs PRU Size18 tones, 1 sub-frame Block SizeFEC Block fills up 3 PRUs Turbo DecodingMax-Log, 8 iterations Turbo CodeLTE Number of OFDM symbols per sub-frame6 Channel ModelTU-6 PrecodingUnitary, optimized Samsung codebook with cycling per RB 2

4 - Transmit 2-Receive Antennas QPSK Channel Estimation is done per PRU. Dedicated pilots used. Codebook optimized with 4 codewords chosen for good distance properties. One codeword is applied per PRU. 3

4 - Transmit 2-Receive Antennas 16-QAM Channel Estimation is done on a per PRU. Dedicated pilots used. Codebook optimized with 4 codewords chosen for good distance properties. One codeword is applied per PRU. 4

4 - Transmit 2-Receive Antennas 64-QAM Channel Estimation is done on a per PRU. Dedicated pilots used. Codebook optimized with 4 codewords chosen for good distance properties. One codeword is applied per PRU. 5

4-Transmit 2 – Receive Antennas MSE of 2D- MMSE Channel Estimator Dedicated pilots used on a TU-6 channel. The pilot pattern for Rank -2 transmission is shown on the right for a PRU. 6

COMPARISON WITH ANTENNA HOPPING FOR 4X2 FULL RANK SM 7

4 - Transmit 2-Receive Antennas QPSK with Channel Estimation 2 out of 4 transmit antennas chosen randomly for Antenna Hopping. 8

4 - Transmit 2-Receive Antennas 16-QAM with Channel Estimation 2 out of 4 transmit antennas chosen randomly for Antenna Hopping. 9

4 - Transmit 2-Receive Antennas 64-QAM with Channel Estimation 2 out of 4 transmit antennas chosen randomly for Antenna Hopping. 10

4 - Transmit 2-Receive Antennas QPSK rate 1/2 with Channel Estimation Antenna’s are hopped per tone in a sub-frame. The hopping pattern for antenna hopping is defined in C802.16m-08/1193r1. Common pilot s used and channel estimation is performed per PRU. Codeword cycling uses dedicated pilots 11

4 - Transmit 2-Receive Antennas 16-QAM rate ½ with Channel Estimation 12 Antenna’s are hopped per tone in a sub-frame. The hopping pattern for antenna hopping is defined in C802.16m-08/1193r1. Common pilot s used and channel estimation is performed per PRU. Codeword cycling uses dedicated pilots

4 - Transmit 2-Receive Antennas QPSK rate 1/2 Goodput with Channel Estimation Antenna’s are hopped per tone in a sub-frame. The hopping pattern for antenna hopping is defined in C802.16m-08/1193r1. Common pilot s used and channel estimation is performed per PRU. Codeword cycling uses dedicated pilots 13

4 - Transmit 2-Receive Antennas 16-QAM rate ½ Goodput with Channel Estimation 14 Antenna’s are hopped per tone in a sub-frame. The hopping pattern for antenna hopping is defined in C802.16m-08/1193r1. Common pilot s used and channel estimation is performed per PRU. Codeword cycling uses dedicated pilots

Observations BLER Performance of precoder cycling is identical to antenna hopping with channel estimation when hopping is done over a PRU – But antenna hopping can have power imbalance that can be avoided by using precoders. Goodput Performance of precoder cycling per PRU with dedicated pilots is better than antenna hopping per tone with common pilots. Recommendations to TGm – Keep the current baseline text in section of the SDD. – Remove SM + Antenna Hopping from the items for FFS in the SDD. 15